CIRCULATING SUB

The Circulating Sub is connected between wellhead pipe string and ground circulating system. When casing is running or completed, the circulating sub can be connected to provide fluid circulation.

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According to the application, circulating sub is connected between Kelly and casing or between casing and a hose.

Construction

The circulating sub during running casing is equipped with casing pin thread on one end and DP thread, DP box thread or union thread on the other.

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